From: krister dot karlstrom at arcada dot fi
Operating system: Linux/Slackware
PHP version: 5.2.5
PHP Bug Type: Class/Object related
Bug description: Interfaces behaving too much like classes
Description:
------------
I found this "weird" mix-up of the behaviour of interfaces and abstract
classes. I think that you should be able to always implement an interface,
regardless of how and where some of the implemented methods where declared
or defined. The only thing that should matter is that the declared class
defines all the methods that the interface requires.
The error message from PHP says that it can't inherit the method
Test::foo() - an implementation of an interface has nothing to do with
inheritance in classes in the OO-model. It shouldn't even try to "inherit"
the methods of the interface, just check that the defined class implements
all of the required methods.
Reproduce code:
---------------
<?php
interface Test
{
public function foo();
}
abstract class Bar
{
public abstract function foo();
}
class FooBar extends Bar implements Test
{
public function foo()
{
echo "Hello!";
}
}
?>
Expected result:
----------------
I expect this to raise no error, because the class FooBar nicely defines
and implements the method foo(), as the interface Test defines.
Actual result:
--------------
[error] PHP Fatal error: Can't inherit abstract function Test::foo()
(previously declared abstract in Bar) in
/var/www/asta.arcada.fi/beta/foobar.php on line 13
--
Edit bug report at http://bugs.php.net/?id=43277&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=43277&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=43277&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=43277&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=43277&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=43277&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=43277&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=43277&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=43277&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=43277&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=43277&r=support
Expected behavior: http://bugs.php.net/fix.php?id=43277&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=43277&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=43277&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=43277&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=43277&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=43277&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=43277&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=43277&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=43277&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=43277&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=43277&r=mysqlcfg
